Can you explain why the 16 reaches max temp before 14 inch?
I believe it is related with number of cores ( GPU ) and how much data will processed constantly, like a 4 minutes single frame render v.s. 1 minute single frame render.
It is not a big issue for video editing data. Any M1 or M2 could handle video easily. Even for video during long exports fans are working constantly. I can compare M1 16 inch MBP with base model Studio max because we use them everyday. Studio is slightly faster and way silent than 16 inch MBP during video editing/exporting.
14 inch have less CPU/GPU cores and power restricted by Apple as far as I know. But 16 inch could use more power which means it will produce more heat. No matter it has got better cooling options as Leman said ''
It's all about thermal output vs. cooling capability. Under prolonged heavy combined load an M1 Max will produce the same amount of heat as a previous Intel i9+dGPU MBP.''
If you feed heavy workloads to 16 inch it will reach fan threshold quicker and will keep working because it has got more room for data processing.
If you use only CPU renderers like Arnold it will reach the fan threshold later than GPU renderers. If you use GPU for look dev which means constantly using GPU cores for hours sometimes, this will kick fans at a point and they keep working during all process. M2 has got more GPU cores which are slightly overclocked and will reach fan level earlier I guess.